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- W2012014185 abstract "Atomic screening effects on the electron-neutrino angular correlation coefficient ${a}_{0}$ and the ensuremath{beta} asymmetry coefficient ${A}_{0}$, in allowed transitions, are studied. It has long been known that the dominant screening effect on the spectrum is the replacement, in the factor which represents the phase space of the ensuremath{beta} particle, of W, the energy with which the ensuremath{beta} particle emerges, by W-${V}_{0}$, the energy with which it is born; ${V}_{0}$ is the energy of interaction of the ensuremath{beta} particle at the origin with the potential generated there by the atomic electrons. [One also replaces the momentum p=p(W) by p'=p(W-${V}_{0}$).] One might well expect a similar result for screening effects on ${a}_{0}$ and ${A}_{0}$, which include the influence of the nuclear Coulomb potential---and this intuitive expectation is shown to be the case. One need merely replace the velocity of emergence v=v(W) in the correlation functions by the velocity at birth, v'=v(W-${V}_{0}$). As for the case of the spectrum, the effect can be obtained by using a static approximation, with the atomic electrons unaffected by the ensuremath{beta} particle, and with the screening potential treated to second order; the effect of virtual or real excitation of the atomic electrons is negligible. The screening effect is of order ${10}^{mathrm{ensuremath{-}}4}$ for most superallowed and mirror image transitions (presently, both theory and experiment for superallowed transitions---with implications for electro-weak theory and the standard model---give ft values accurate to about one part in ${10}^{3}$); it can be as large as 20% for some pure Gamow-Teller transitions, for which the nuclear matrix element does not enter into the analysis of ${a}_{0}$ and ${A}_{0}$." @default.
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- W2012014185 date "1989-09-01" @default.
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- W2012014185 title "Atomic screening effects on electron-neutrino angular correlation andβ-decay asymmetry in allowed transitions" @default.
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- W2012014185 doi "https://doi.org/10.1103/physrevc.40.1376" @default.
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